Answer:
The formed wittig reagent is [tex]ph-CH =PPh_{3}[/tex]
Explanation:
Wittig reagent are usually prepared from a phosphonium salt which is obtained by the reaction of triphenyl Phosphine with an alkyl halide via an Sn² reaction.
The alkyl phosphonium salt is deprotonated with a strong base (C₄H₉Li) or, Butyl lithium.
